MATLAB: Not showing number of frames for specific video even if it is present in current path in matlab

MATLABvideo processing

Below code is showing error for correct_script_video.avi.But it is working fine for other videos.This video is present in current path but still its showing error.What is the reason?
Error is:
       Error in VideoReader (line 132)
        obj.init(fileName);
      Error in framescheck (line 1)
        obj = VideoReader('correct_script_video.avi');
Source code:
      vid = VideoReader('correct_script_video.avi');
      nFrames=vid.NumberOfFrames;
      nFrames

Best Answer

AVI that are Variable Frame Rate cannot show the number of frames until the video has been read all the way to the end.
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